[CFT] kill darwin encode_section_info

[Richard Henderson <rth at twiddle dot net>]

Gets rid of lots of Very Wrong frobbing of the interned
strings in the symbol table.

Instead we use UNSPEC patterns to record that a given type
of addressing is desired (base-relative or non_lazy_ptr)
and delay creating the backing data structures for these
until the instructions are actually emitted during final.

Since I don't have a darwin system myself, I can't test
more than just cross-compilation.  I have a little test
program that generates one of every kind of relocation,
and that seems to work, but...

Anyway, I'd appreciate someone testing this for real.


r~

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